摘要:
An improved method for the production of phenol, acetone and alpha-methyl styrene (AMS) from a cumene hydroperoxide and dimethylbenzyl alcohol (DMBA) mixture is described, wherein 0.5-5% additional water by weight is added prior to the final DMBA dehydration step, carried out in the presence of about 20-400 ppm mineral acid catalyst at 110-150° C. for 0.5 to 40 minutes residence time. The use of additional water allows greater flexibility in maintaining optimum temperature in the second stage over a much broader turndown range with fixed equipment, decreases the residual dicumyl peroxide (DCP) at the yield optimum for a given temperature, and increases the overall yield of AMS at optimum conditions at a given temperature.
摘要:
Disclosed herein are a reaction method and a production method of an organic compound which are capable of achieving high reaction selectivity according to the purpose and a high production rate of a target substance. The methods include at least two fluids, wherein at least one kind of the fluids is a fluid containing at least one organic compound and at least one kind of the fluids other than the above fluid is a fluid containing at least one reactant in the form of a liquid or solution, and the respective fluids join together in a thin film fluid formed between processing surfaces arranged to be opposite to each other so as to be able to approach to and separate from each other, at least one of which rotates relative to the other, whereby an organic reaction is performed in the thin film fluid.
摘要:
A method for alkylating a hydrocarbon comprising at least one isoparaffin and at least one olefin by introducing liquid acid catalyst and the hydrocarbon into a high shear reactor, forming an emulsion comprising droplets comprising hydrocarbon in a continuous acid phase, wherein the droplets have a mean diameter of less than about 5 microns, introducing the emulsion into a vessel operating under suitable alkylation conditions whereby at least a portion of the isoparaffin is alkylated with the olefin to form alkylate, and removing a product stream comprising alkylate from the vessel. A system for carrying out the method is also disclosed.
摘要:
The present invention relates to a process for making isooctenes using dry isobutanol derived from fermentation broth. The isooctenes so produced are useful for the production of fuel additives.
摘要:
Disclosed is a process for the cleavage of technical cumene hydroperoxide (CHP) into phenol, acetone and α-methylstyrene. In a first stage, the CHP cleavage process is conducted in such a way to maintain the heat generation rate and the heat removal rate balanced in each of the CHP cleavage reactors. The cleavage of the CHP is conducted under substantially isothermal conditions at a temperature in the range of 47-50 °C. In the second stage of the process dicumylperoxide (DCP) and dimethylbenzene alcohol (DMBA) cleavage is carried out in a multi-section plug-flow reactor under non-isothermal conditions at a controlled temperature increase. The temperature is controlled with the use of thermocouples installed in each section of the reactor. The obtained temperature profile is compared with the temperature profile required by the kinetic model based on ΔT in each section of the reactor. Based on any obtained fluctuations at least one of the amount of water additionally fed to the reactor, the temperature and the degree of sulfuric acid conversion into NH4HSO4 are adjusted.
摘要:
A method of operating a multi-phase downflow reactor so as to induce a pulsing flow regime is disclosed. The pulse may be induced by increasing the gas rate (12) while maintaining the Liquid rate until a pressure drop sufficient to induce the pulse flow is achieved. The method is particularly useful in the sulfuric acid catalyzed alkylation of olefins in a reactor packed with a stainless steel/polypropylene mesh (40).
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von Alkenen durch Wasserabspaltung aus Alkoholaten bzw. Alkoholen mit mindestens einer CH-Gruppe in α-Stellung zur Alkoholat- bzw. Alkohol-Funktion, bei dem a) das Alkoholat bzw. der Alkohol in mindestens einem Lösungsmittel vorgelegt und temperiert wird, b) mindestens eine Säure in mindestens einem Lösungsmittel getrennt vorgelegt und temperiert wird, c) die Eduktlösungen aus a) und b) getrennt voneinander in mindestens einen temperierten Durchflussreaktor geleitet und dort zusammengeführt werden, d) das Reaktionsgemisch abgeleitet wird und dieses gesammelt, aufgearbeitet und/oder in einer oder mehreren nachgeschalteten Reaktionen weiter umgesetzt wird. Das erfindungsgemäße Verfahren erlaubt die kontinuierliche Synthese von Alkenen aus den entsprechenden Alkoholaten bzw. Alkoholen in hohen bis sehr hohen Ausbeuten.